chore: add more logs on manifest and initial power table

[hanabi1224]

This PR adds more F3 startup logs for easier troubleshooting.

After the change:

...
2024-10-15T13:15:14.693+0800    INFO    f3      go-f3/store.go:50       loaded initial power table at epoch 1860: bafy2bzaced6vgp6agebcyymrmh3q2r6gmiz3owb2b7kz5h744u7frlkdpg3qy
...
2024-10-15T13:15:14.704+0800    INFO    f3      go-f3/f3.go:200 F3 is starting  {"initialDelay": 0, "hasPendingManifest": false, "NetworkName": "butterflynet", "bootstrapEpoch": 2760, "finality": 900, "initialPowerTable": "b"}

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 74.79%. Comparing base (25c3ade) to head (f7e0500).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
store.go	40.00%	2 Missing and 1 partial ⚠️
f3.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #714      +/-   ##
==========================================
- Coverage   76.28%   74.79%   -1.50%     
==========================================
  Files          69       69              
  Lines        5584     6928    +1344     
==========================================
+ Hits         4260     5182     +922     
- Misses        912     1331     +419     
- Partials      412      415       +3     

Files with missing lines	Coverage Δ
f3.go	61.53% <66.66%> (-7.73%)	⬇️
store.go	48.71% <40.00%> (-8.98%)	⬇️

... and 55 files with indirect coverage changes